Technically I would like the car to be fully in accordance with 1973 specs .
This would mean :
Brakes
Front : Calipers- Steel ATE 42 two pot
Disks : 256 x 12,4 unvented
Rear : calipers - Streel ATE 34 two pot
Disks : 256 x 9.6 unvented .
However, it is worth noting that the 1972 Appendix J is pretty liberal ( as compared to its later versions). Under art 266 , art, 260 and art.257 ( as applicable) the appendix J of 1972 allows multiple modifications or key systems including the following :
Braking system:
- a/ the mounting of a double pump (master cylinder) or of any device which produces simultaneous action on the four wheels and a separate action on two wheels is allowed.
b/ the discs and drums may be replaced by others provided the area of the friction surface is not modified.
c/ the backing plates may be modified and fitted with air openings.
d/ protection shields may be modified or suppressed.
e/ cooling air-ducts may be added provided they do not entail a modification of the coachwork.
f/ the mechanism of the handbrake lever may be adapted for obtaining an instantaneous unbolting (fly-off handbrake).
Engine capacity: homologated 1756 cc (84 x 79.2) but appendix J allows for engine reboring which may increase engine capacity up to class limit (2,0 !!!)
Carburetors: homologated: Weber 44 IDF 20 or 21 on a waffle intake manifold .
(no change allowed)
Engine Lubrication system : homologated standard wet sump but appendix J allows liberal changes:
- a/ the oil sump may be modified or replaced by another one of different shape and capacity.
b/ the oil pump may be modified or replaced by another one. Yet, the number of oil pumps originally fitted cannot he changed.
c/ oil filters and oil coolers are free (type, number and capacity).
Fuel tanks:
- a/ the capacity of fuel tanks is free up to the limit specified under Art. 253 D( 100 liters) .
b/ the location and dimensions of the filler orifice as well as those of the filling cap may he changed provided the new fitting does not protrude beyond the coachwork line and provides against fuel leakage into
the inside compartments of the car.
c/ should the tank and its filler be located in the luggage compartment, an outlet at the lowest point must be provided for the fuel accidentally spilled in this compartment.
This means that I can install a gr 4 later homologated 78 liters aluminum safety fuel tank.
Fuel pump: homlogated single electric fuel pump but by Appendix J : free as to number and type (will install two Red Top Facet pumps switchable from the dash )
Differential ratio : homologated 4.3 (43/10) and 5,375 (43/8). But ratios are free ,and so is LSD (but no permanent 100%).
With a number of gear sets sitting on a garage shelf - this can be changed depending on the event.
Gearbox - ratios are free, but I am not sure if my 2.0 CSO gearbox can be fitted onto the 1800 engine. this remains to be determined later.
Looks like an interesting setup with possibilities.
Miro
PS: Appendix J of 1973 at least partially explains why certain elements were not homologated in 1972. The 1972 appendix J remained valid until end of 1974
Note that many of these elements could be freely used between 1972 and 1974 but due to a stricter limitations on allowed modifications introduced by the 1975 Appendix J had to be homologated to continue using them.
M